MA Shi-zhong,CHEN Jian-ping,LIU Xin-guo,JIN Ji-yuan,REN Zhen-dong(Jisan Coal Preparation Plant,Yanzhou Coal Mining Co.,Ltd.,Jining 272069,China)The analysis of dense-medium coal preparation process in Jisan coal preparation plant show that there are lots of problems,involving high moisture in slime,large slime content in primary underflow,high concentration washing water,unstable feeding into dense-medium cyclone,low medium recovery and the like.Through researching medium consumption,raw materials into clean coal and middlings magnetic separator and magnetic substance in tailings,find that large pore size of sieve plate of medium draining screen,low water pressure,frequent nozzle jaming,unstable feeding into clean coal and middlings magnetic separator and poor medium quality lead to high medium consumption.To resolve these problems,adjust the pore size of sieve plate,improve water pressure,transform nozzle of medium draining screen and dense-medium cyclone,guarantee medium quantity and so on.The results show that,the water and medium consumption remarkably drop.Compare with the medium consumption in June,2010,it decreases from 2.710 kg/t to 1.424 kg/t in June,2011,the water consumption decreases from 0.055 kg/t to 0.045 kg/t,save medium 1286 tons in one year which worth 1.94 million yuan.
2012 04 v.18;No.80 [Abstract][OnlineView][Download 587K]